<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="isAll"/>
    </label>
    <span> <span>已完成{{doneTotal}}</span> / 全部{{total}} </span>
    <button class="btn btn-danger" @click="handleClear">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Footer",
	props:['clearAllDone','todos','checkAll'],
	methods:{
		handleClear(){
			if(confirm('确定清除已完成吗？')){
				this.clearAllDone()
			}
		}
	},
	computed:{
		total(){
			return this.todos.length
		},
		doneTotal(){
			/* let n = 0
			this.todos.forEach((t) => {
				if(t.done){
					n++
				}
			});
			return n */
			return this.todos.filter(t => t.done).length
		},
		isAll:{
			get(){
				return this.todos.every((t)=>{
					return t.done === true
				}) && this.todos.length
			},
			set(value){
				this.checkAll(value)
			}
		}
	}
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>